Iron manufacture.



UNITED STATES PATENT oF oE,

ROBERT B. oarmanan, an, or nrnnnnrown, OHIO, assmnon TO THE m'rnnna- 'lIONAL mn'ranrnonocrs company; or NEWARK, new JERSEY..

IRON MANUFACTURE.

Specification of Letters Patent.

Patented. Mar. '7, 1911.

= NoDrawing. Application filed July 30. 1908, Serial No. 446,124. Renewed September 10, 1910. Serial No.

at Middletown, Butler county, Ohio, have invented certain new and useful Improvements in, Iron Manufacture, of which the following is a specification.

The present invention, comprehending the roduction of a markedly superior grade of iron from com a'ratively low priced material and by a met 10d characterized by special economy and regular certainty of result, will be readily understood from the following description.

There is to be employed a high-powered furnace capable of what might be termed a particularly fierce action. Having. in view the completionof the ultimate product and the other material charged into the furnace, the furnace is to be charged with lime to bring the sulfur .and phosphorus down to the limit 'hereinafterstated for, the product, and it is to be charged with iron ojre-t-o bring down the carbon and manganese to the limit hereinafter stated for the product.

The furnace is to be charged with pig iron of the following characteristics :-Must be machine cast, sand castpig being unsuitable. Phosphorus to be not over 1%, and as low as possible. and as low as possible. Silicon to be not over 2% and as low as possible. Up to of ordinary wrought iron or steel-scrap, wrought ironmuch preferred, may be added, but not malleable or other cast iron scap. All is to be melted and brought to a temperature of not .less than 2850 deg. Fah. 'Tap into ladle with a degasifying agent, aluminum preferred. .Cast in ingot mold. Everything from tapping to casting is to be donewith utmostn-apidit'y. After the charge has been brought to its hi h heat, no temperatures less than 2775 deg. ah. must exist in the metal before it reaches the in ot mold. The resulting ingot is practical y free from iping. The ingot thus produced represents t e best of iron products made from comparatively cheap material and b an economical and practically regular an certain method.

Sulfur to be not. over 05%,

The inaterial of the ingot has the following characteristics :Structure is crystalline. Density greater than purest charcoal iron. D'uctility extremely high. Tensile strength equal to extra good charcoal iron. Forges and rolls with facility at usual temperatures sulfur below 035%, ph sphorus below 075%,

carbon below .1576.

In the above analysis maximum values are given and the perfection of the product and the practical regularity and certainty of the method may be judged from the fact that in every day practice by this method I am re ularly producing a product analyzed as follows :silicon, trace; manganese, .030; sulfur, .020; phosphorus, .005; carbon, .030;

iron, 99.915.

I claim I i The improved method of iron manufacture consistingffirst, in taking machine cast pig iron whose phosphorus is not over 1% and whose sulfur is notover .05 0 and whose silicon is not over 2%, along with lime to reduce sulfur and phosphorus, and iron ore to reduce carbon and manganese: second, melting the charge and bringmg it to a temperature of not less than 2850 deg. Falm" third, tapping the melted hot charge into a ladle with a degasifying agent: fourth, ouring the ladle c arge into an ingot mol the temperature between tap ing and ouring to beat no time below 27 5 deg. Fa substantially as set forth.

1 ROBERT B. OARNAHAN, JR.

' Witnesses: PAUL M. Hoovnn, M. S. Barman. 

